tree 8938dee1a5128421057ebbea95f160727f90d137
parent 574940d9b4e0659d3b0c30df82e237f42eee2b49
author Trond Myklebust <trondmy@gmail.com> 1580684034 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1581715867 -0500

NFS: Directory page cache pages need to be locked when read

[ Upstream commit 114de38225d9b300f027e2aec9afbb6e0def154b ]

When a NFS directory page cache page is removed from the page cache,
its contents are freed through a call to nfs_readdir_clear_array().
To prevent the removal of the page cache entry until after we've
finished reading it, we must take the page lock.

Fixes: 11de3b11e08c ("NFS: Fix a memory leak in nfs_readdir")
Cc: stable@vger.kernel.org # v2.6.37+
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>